:root {
  color-scheme: light;
  --bg: #f5f7fb;
  --sky: #d9efff;
  --cloud: #ffffff;
  --ink: #243044;
  --muted: #64748b;
  --line: #d7e1ef;
  --green: #58cc02;
  --green-dark: #2f7f00;
  --orange: #ff9600;
  --yellow: #ffc800;
  --blue: #1cb0f6;
  --purple: #8b5cf6;
  --rose: #ff6b8a;
  --danger: #d13434;
  --shadow: 0 10px 0 #dbe4f0, 0 24px 50px rgba(35, 48, 68, 0.14);
  --soft-shadow: 0 6px 0 #dbe4f0, 0 18px 36px rgba(35, 48, 68, 0.11);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-width: 320px;
  background:
    radial-gradient(circle at 12% 8%, rgba(255, 200, 0, 0.28), transparent 26%),
    radial-gradient(circle at 88% 10%, rgba(28, 176, 246, 0.22), transparent 24%),
    linear-gradient(180deg, var(--sky) 0, #f5f7fb 360px);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

a {
  color: #0f7fc2;
  font-weight: 800;
  text-underline-offset: 0.18em;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 3px solid rgba(28, 176, 246, 0.45);
  outline-offset: 3px;
}

.app-shell {
  width: min(1220px, calc(100% - 32px));
  margin: 0 auto;
  padding: 22px 0 54px;
}

.topbar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 18px;
  align-items: center;
  margin-bottom: 18px;
}

.brand-lockup {
  display: flex;
  gap: 14px;
  align-items: center;
  min-width: 0;
}

.brand-mark {
  display: grid;
  flex: 0 0 auto;
  width: 58px;
  height: 58px;
  place-items: center;
  border: 3px solid #1e7f43;
  border-radius: 18px;
  background: linear-gradient(145deg, var(--green), #a8e65d);
  box-shadow: 0 6px 0 #2f7f00;
  color: #16350f;
  font-size: 1.7rem;
  font-weight: 1000;
}

.eyebrow {
  margin: 0 0 4px;
  color: #116c9f;
  font-size: 0.76rem;
  font-weight: 1000;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin: 0;
  letter-spacing: 0;
  line-height: 1.08;
}

h1 {
  font-size: clamp(2rem, 5vw, 4.2rem);
  font-weight: 1000;
}

h2 {
  font-size: clamp(1.55rem, 3.4vw, 2.55rem);
  font-weight: 1000;
}

h3 {
  font-size: 0.98rem;
  font-weight: 1000;
}

.top-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: flex-end;
}

.ghost-button,
.primary-button,
.danger-button,
.tab {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--line);
  border-radius: 16px;
  padding: 10px 16px;
  background: var(--cloud);
  color: var(--ink);
  box-shadow: 0 4px 0 #dbe4f0;
  font-weight: 1000;
}

.ghost-button:hover,
.tab:hover {
  border-color: var(--blue);
  transform: translateY(-1px);
}

.ghost-button:disabled,
.primary-button:disabled,
.danger-button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
  transform: none;
}

.primary-button {
  border-color: #39a600;
  background: var(--green);
  box-shadow: 0 5px 0 #2f7f00;
  color: #123b00;
}

.danger-button {
  border-color: #e2a5a5;
  background: #fff2f2;
  box-shadow: 0 4px 0 #e6c4c4;
  color: #992222;
}

.file-button {
  align-items: center;
}

#importFile {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.overview {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(240px, 330px);
  gap: 20px;
  align-items: stretch;
  margin-bottom: 18px;
  padding: 22px;
  border: 2px solid #cfe1f2;
  border-radius: 26px;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.92), rgba(236, 250, 255, 0.92)),
    var(--cloud);
  box-shadow: var(--shadow);
}

.overview-copy {
  display: grid;
  align-content: center;
  min-width: 0;
}

.overview-copy p:last-child,
.progress-block p {
  margin: 10px 0 0;
  color: var(--muted);
  font-weight: 750;
}

.progress-block {
  display: grid;
  align-content: center;
  gap: 10px;
  padding: 16px;
  border: 2px solid #dfe9f5;
  border-radius: 22px;
  background: #f8fbff;
}

.progress-number {
  color: var(--green-dark);
  font-size: 2.65rem;
  font-weight: 1000;
}

.progress-track {
  height: 17px;
  overflow: hidden;
  border: 2px solid #cfddeb;
  border-radius: 999px;
  background: #e9f0f7;
}

.progress-track span {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--green), var(--yellow), var(--orange));
  transition: width 180ms ease;
}

.tabs {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  width: min(820px, 100%);
  margin: 0 auto 18px;
  padding: 8px;
  border: 2px solid #d7e1ef;
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.72);
}

.tab {
  box-shadow: none;
  border-color: transparent;
  border-radius: 16px;
  background: transparent;
}

.tab.is-active {
  border-color: #39a600;
  background: var(--green);
  box-shadow: 0 4px 0 #2f7f00;
  color: #123b00;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  align-items: start;
}

.workspace.has-lesson-map {
  grid-template-columns: minmax(300px, 370px) minmax(0, 1fr);
}

.lesson-list,
.detail {
  border: 2px solid #d7e1ef;
  border-radius: 28px;
  background: var(--cloud);
  box-shadow: var(--shadow);
}

.lesson-list {
  display: none;
  position: sticky;
  top: 16px;
  max-height: calc(100vh - 32px);
  overflow: auto;
  padding: 16px 14px 22px;
}

.workspace.has-lesson-map .lesson-list {
  display: block;
}

.search-wrap {
  position: sticky;
  top: 0;
  z-index: 2;
  display: grid;
  gap: 8px;
  margin-bottom: 14px;
  padding-bottom: 12px;
  background: var(--cloud);
}

.search-wrap label {
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 1000;
}

input,
select,
textarea {
  width: 100%;
  min-width: 0;
  border: 2px solid #d7e1ef;
  border-radius: 16px;
  background: #fff;
  color: var(--ink);
}

input {
  min-height: 46px;
  padding: 10px 13px;
  font-weight: 700;
}

select {
  min-height: 46px;
  padding: 10px 42px 10px 13px;
  font-weight: 850;
}

textarea {
  min-height: 118px;
  padding: 13px;
  resize: vertical;
}

#lessonList {
  position: relative;
  display: grid;
  gap: 16px;
  padding: 8px 0 4px;
}

#lessonList::before {
  content: "";
  position: absolute;
  top: 18px;
  bottom: 18px;
  left: 42px;
  width: 8px;
  border-radius: 999px;
  background: #dce8f3;
}

.lesson-button {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 70px minmax(0, 1fr);
  gap: 10px;
  width: 100%;
  min-height: 82px;
  padding: 10px 12px 10px 0;
  border: 0;
  border-radius: 22px;
  background: transparent;
  color: var(--ink);
  text-align: left;
}

.lesson-button:nth-child(even) {
  padding-left: 18px;
}

.lesson-button:hover .lesson-card,
.lesson-button.is-active .lesson-card {
  border-color: var(--blue);
  transform: translateY(-2px);
}

.lesson-button.is-active .lesson-card {
  background: #edf9ff;
}

.lesson-button.is-complete .lesson-day {
  border-color: #39a600;
  background: var(--green);
  box-shadow: 0 5px 0 #2f7f00;
  color: #123b00;
}

.lesson-button.has-progress:not(.is-complete) .lesson-day {
  border-color: #e6a100;
  background: var(--yellow);
  box-shadow: 0 5px 0 #bd7f00;
  color: #4f3200;
}

.lesson-day {
  display: grid;
  width: 58px;
  height: 58px;
  place-items: center;
  align-self: center;
  border: 3px solid #c9d8e6;
  border-radius: 50%;
  background: #eef4fa;
  box-shadow: 0 5px 0 #c3d1df;
  color: #52657c;
  font-size: 1rem;
  font-weight: 1000;
}

.lesson-card {
  display: grid;
  min-width: 0;
  gap: 4px;
  padding: 13px 14px;
  border: 2px solid #d7e1ef;
  border-radius: 18px;
  background: #fff;
  box-shadow: var(--soft-shadow);
  transition: transform 120ms ease, border-color 120ms ease, background 120ms ease;
}

.lesson-title {
  min-width: 0;
  overflow-wrap: anywhere;
  font-weight: 1000;
  line-height: 1.18;
}

.lesson-state {
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 850;
}

.detail {
  min-width: 0;
  overflow: hidden;
}

.detail-header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 16px;
  align-items: start;
  padding: 24px;
  border-bottom: 2px solid #d7e1ef;
  background:
    radial-gradient(circle at 95% 8%, rgba(255, 200, 0, 0.26), transparent 26%),
    linear-gradient(135deg, #ffffff, #ecf9ff);
}

.status-pill {
  flex: 0 0 auto;
  border: 2px solid #39a600;
  border-radius: 999px;
  padding: 8px 13px;
  background: #e8ffd9;
  color: #1f6700;
  font-size: 0.84rem;
  font-weight: 1000;
}

.time-pill {
  display: inline-flex;
  min-height: 34px;
  align-items: center;
  justify-content: center;
  margin-top: 10px;
  border: 2px solid #ffbf47;
  border-radius: 999px;
  padding: 5px 12px;
  background: #fff4c7;
  color: #7a3900;
  font-size: 0.82rem;
  font-weight: 1000;
}

.lesson-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.lesson-picker {
  display: grid;
  max-width: 520px;
  gap: 8px;
  margin-top: 16px;
}

.lesson-picker span {
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 1000;
}

.section-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  padding: 20px;
}

.section {
  min-width: 0;
  padding: 18px;
  border: 2px solid #d7e1ef;
  border-radius: 22px;
  background: #fff;
  box-shadow: 0 5px 0 #dbe4f0;
}

.section.is-wide {
  grid-column: 1 / -1;
}

.section h3 {
  margin-bottom: 10px;
  color: #384e68;
}

.section p {
  margin: 0;
}

.checklist {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.checklist-header,
.flag-group {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  align-items: start;
  margin-bottom: 12px;
}

.checklist-header h3,
.flag-group h3 {
  margin-bottom: 4px;
}

.checklist-header p,
.flag-group p {
  margin: 0;
}

.mini-status {
  display: inline-flex;
  min-height: 36px;
  align-items: center;
  justify-content: center;
  white-space: nowrap;
  border: 2px solid #bfe7a8;
  border-radius: 999px;
  padding: 6px 12px;
  background: #efffe8;
  color: #1f6700;
  font-size: 0.8rem;
  font-weight: 1000;
}

.check-item {
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
  min-width: 0;
  padding: 12px;
  border: 2px solid #d7e1ef;
  border-radius: 18px;
  background: #f8fbff;
  color: var(--ink);
  font-weight: 850;
}

.check-item input {
  width: 22px;
  min-height: 22px;
  height: 22px;
  margin-top: 1px;
  accent-color: var(--green);
}

.check-item:has(input:checked) {
  border-color: #65c934;
  background: #efffe8;
}

.flag-group {
  margin: 16px 0 0;
  padding-top: 16px;
  border-top: 2px dashed #d7e1ef;
}

.flag-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.check-item.is-flag {
  border-color: #ead7a3;
  background: #fffaf0;
  color: #6f4e00;
  box-shadow: none;
}

.check-item.is-flag input {
  accent-color: var(--orange);
}

.check-item.is-flag:has(input:checked) {
  border-color: #ffb23d;
  background: #fff0ce;
}

.definition-list,
.resource-list,
.progress-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.definition-list {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.definition-list li,
.resource-list li,
.progress-list li {
  min-width: 0;
  padding: 13px;
  border: 2px solid #d7e1ef;
  border-radius: 18px;
  background: #f8fbff;
  overflow-wrap: anywhere;
}

.definition-term {
  display: block;
  margin-bottom: 4px;
  color: #0f7a4f;
  font-weight: 1000;
}

.notes-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 12px;
}

.glossary-toolbar {
  display: grid;
  gap: 8px;
  margin: 18px 0 12px;
}

.glossary-toolbar label {
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 1000;
}

.progress-list {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.progress-list li strong {
  display: block;
  margin-bottom: 4px;
}

.muted {
  color: var(--muted);
}

@media (max-width: 940px) {
  .app-shell {
    width: min(100% - 22px, 780px);
    padding-top: 14px;
  }

  .topbar,
  .overview,
  .workspace.has-lesson-map,
  .detail-header {
    grid-template-columns: 1fr;
  }

  .top-actions {
    justify-content: start;
  }

  .lesson-list {
    position: static;
    max-height: none;
  }

  .detail {
    order: -1;
  }

  .section-grid,
  .definition-list,
  .progress-list {
    grid-template-columns: 1fr;
  }

  .checklist-header,
  .flag-group {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .app-shell {
    width: min(100% - 14px, 500px);
  }

  .topbar {
    grid-template-columns: 1fr;
  }

  .brand-mark {
    width: 46px;
    height: 46px;
    border-radius: 14px;
    font-size: 1.25rem;
  }

  .overview,
  .detail-header,
  .section-grid,
  .lesson-list {
    padding: 14px;
  }

  .tabs {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    width: 100%;
  }

  .checklist,
  .flag-list {
    grid-template-columns: 1fr;
  }

  .top-actions {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    width: 100%;
  }

  .tab,
  .ghost-button,
  .primary-button,
  .danger-button {
    width: 100%;
  }

  .lesson-button,
  .lesson-button:nth-child(even) {
    grid-template-columns: 56px minmax(0, 1fr);
    padding-left: 0;
    padding-right: 0;
  }

  #lessonList::before {
    left: 28px;
  }

  .lesson-day {
    width: 48px;
    height: 48px;
  }
}